Browsing by Author "Hsu, I-Jen"

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Enhanced Conversion Efficiency of GaAs Solar Cells Using Ag Nanoparticles
(2010-12-01)
Shu, Gia-Wei
;
Liao, Wei-Chuan
;
Hsu, Ching-Ling
;
Lee, Ja-Yuan
;
Hsu, I-Jen
We have studied the enhancement of conversion efficiency in GaAs solar cells using silver nanoparticles with particle average sizes between 11.4 to 17.2 nm. The maximum enhancement of 20.2% in conversion efficiency is achieved for the GaAs solar cells where the Ag nanoparticles have been incorporated. The simulations according to Mie theory suggest that the increased radiative scattering and conversion efficiency is due to a combined effect of the surface plasmon resonance and the interband transition.
The effects of Gaussian beams on optical coherence tomography
(2007-01-01)
Liu, Chun-Chu
;
Cheng, Chi-Hsiang
;
Chiu, Chien-Wei
;
Hsu, I-Jen
;
電子物理學系
The theory of optical coherence tomography (OCT) was conventionally considered as the light beams propagating in the system to be in the forms of planar waves. However, the actual behaviors of the light beams in an OCT system are more likely to be Gaussian beams. With the consideration of the light beam passing through the focal lens in the sample arm to be a Gaussian beam, we deduced the theory of OCT in an analytic form. We also simulated and analyzed the interference signals with different positions of the photodetector and the interface in the sample as well as their transverse patterns spectrally. The results were demonstrated by experiments with a Fourier-domain OCT system.
The effects of Gaussian beams on optical coherence tomography - art. no. 66270T
(2007)
Liu, Chun-Chu
;
Cheng, Chi-Hsiang
;
Chiu, Chien-Wei
;
Hsu, I-Jen
;
電子物理學系
The theory of optical coherence tomography (OCT) was conventionally considered as the light beams propagating in the system to be in the forms of planar waves. However, the actual behaviors of the light beams in an OCT system are more likely to be Gaussian beams. With the consideration of the light beam passing through the focal lens in the sample arm to be a Gaussian beam, we deduced the theory of OCT in an analytic form. We also simulated and analyzed the interference signals with different positions of the photodetector and the interface in the sample as well as their transverse patterns spectrally. The results were demonstrated by experiments with a Fourier-domain OCT system.